On Fri, Nov 03, 2017 at 03:53:02PM +1100, Andrew Jeffery wrote: > The Maxim MAX31785 is a PMBus device providing closed-loop, multi-channel fan > management with temperature and remote voltage sensing. Various fan control > features are provided, including PWM frequency control, temperature hysteresis, > dual tachometer measurements, and fan health monitoring. > I updated the above text a little to make it more obvious that "are provided" refers to the chip, not (yet) to the driver. > This patch presents a basic driver using only the existing features of the > PMBus subsystem. > > Signed-off-by: Andrew Jeffery <andrew@xxxxxxxx> Applied to hwmon-next. > --- > Documentation/hwmon/max31785 | 51 ++++++++++++++++++ > drivers/hwmon/pmbus/Kconfig | 10 ++++ > drivers/hwmon/pmbus/Makefile | 1 + > drivers/hwmon/pmbus/max31785.c | 116 +++++++++++++++++++++++++++++++++++++++++ > 4 files changed, 178 insertions(+) > create mode 100644 Documentation/hwmon/max31785 > create mode 100644 drivers/hwmon/pmbus/max31785.c > > diff --git a/Documentation/hwmon/max31785 b/Documentation/hwmon/max31785 > new file mode 100644 > index 000000000000..45fb6093dec2 > --- /dev/null > +++ b/Documentation/hwmon/max31785 > @@ -0,0 +1,51 @@ > +Kernel driver max31785 > +====================== > + > +Supported chips: > + * Maxim MAX31785, MAX31785A > + Prefix: 'max31785' or 'max31785a' > + Addresses scanned: - > + Datasheet: https://datasheets.maximintegrated.com/en/ds/MAX31785.pdf > + > +Author: Andrew Jeffery <andrew@xxxxxxxx> > + > +Description > +----------- > + > +The Maxim MAX31785 is a PMBus device providing closed-loop, multi-channel fan > +management with temperature and remote voltage sensing. Various fan control > +features are provided, including PWM frequency control, temperature hysteresis, > +dual tachometer measurements, and fan health monitoring. > + > +For dual rotor fan configuration, the MAX31785 exposes the slowest rotor of the > +two in the fan[1-4]_input attributes. > + > +Usage Notes > +----------- > + > +This driver does not probe for PMBus devices. You will have to instantiate > +devices explicitly. > + > +Sysfs attributes > +---------------- > + > +fan[1-4]_alarm Fan alarm. > +fan[1-4]_fault Fan fault. > +fan[1-4]_input Fan RPM. > + > +in[1-6]_crit Critical maximum output voltage > +in[1-6]_crit_alarm Output voltage critical high alarm > +in[1-6]_input Measured output voltage > +in[1-6]_label "vout[18-23]" > +in[1-6]_lcrit Critical minimum output voltage > +in[1-6]_lcrit_alarm Output voltage critical low alarm > +in[1-6]_max Maximum output voltage > +in[1-6]_max_alarm Output voltage high alarm > +in[1-6]_min Minimum output voltage > +in[1-6]_min_alarm Output voltage low alarm > + > +temp[1-11]_crit Critical high temperature > +temp[1-11]_crit_alarm Chip temperature critical high alarm > +temp[1-11]_input Measured temperature > +temp[1-11]_max Maximum temperature > +temp[1-11]_max_alarm Chip temperature high alarm > diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig > index 40019325b517..08479006c7f9 100644 > --- a/drivers/hwmon/pmbus/Kconfig > +++ b/drivers/hwmon/pmbus/Kconfig > @@ -114,6 +114,16 @@ config SENSORS_MAX20751 > This driver can also be built as a module. If so, the module will > be called max20751. > > +config SENSORS_MAX31785 > + tristate "Maxim MAX31785 and compatibles" > + default n > + help > + If you say yes here you get hardware monitoring support for Maxim > + MAX31785. > + > + This driver can also be built as a module. If so, the module will > + be called max31785. > + > config SENSORS_MAX34440 > tristate "Maxim MAX34440 and compatibles" > default n > diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile > index 459a6be3390e..a8bf0e490db9 100644 > --- a/drivers/hwmon/pmbus/Makefile > +++ b/drivers/hwmon/pmbus/Makefile > @@ -12,6 +12,7 @@ obj-$(CONFIG_SENSORS_LTC2978) += ltc2978.o > obj-$(CONFIG_SENSORS_LTC3815) += ltc3815.o > obj-$(CONFIG_SENSORS_MAX16064) += max16064.o > obj-$(CONFIG_SENSORS_MAX20751) += max20751.o > +obj-$(CONFIG_SENSORS_MAX31785) += max31785.o > obj-$(CONFIG_SENSORS_MAX34440) += max34440.o > obj-$(CONFIG_SENSORS_MAX8688) += max8688.o > obj-$(CONFIG_SENSORS_TPS40422) += tps40422.o > diff --git a/drivers/hwmon/pmbus/max31785.c b/drivers/hwmon/pmbus/max31785.c > new file mode 100644 > index 000000000000..9313849d5160 > --- /dev/null > +++ b/drivers/hwmon/pmbus/max31785.c > @@ -0,0 +1,116 @@ > +/* > + * Copyright (C) 2017 IBM Corp. > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License as published by > + * the Free Software Foundation; either version 2 of the License, or > + * (at your option) any later version. > + */ > + > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/init.h> > +#include <linux/err.h> > +#include <linux/i2c.h> > +#include "pmbus.h" > + > +enum max31785_regs { > + MFR_REVISION = 0x9b, > +}; > + > +#define MAX31785_NR_PAGES 23 > + > +#define MAX31785_FAN_FUNCS \ > + (PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12) > + > +#define MAX31785_TEMP_FUNCS \ > + (PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP) > + > +#define MAX31785_VOUT_FUNCS \ > + (PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT) > + > +static const struct pmbus_driver_info max31785_info = { > + .pages = MAX31785_NR_PAGES, > + > + /* RPM */ > + .format[PSC_FAN] = direct, > + .m[PSC_FAN] = 1, > + .b[PSC_FAN] = 0, > + .R[PSC_FAN] = 0, > + .func[0] = MAX31785_FAN_FUNCS, > + .func[1] = MAX31785_FAN_FUNCS, > + .func[2] = MAX31785_FAN_FUNCS, > + .func[3] = MAX31785_FAN_FUNCS, > + .func[4] = MAX31785_FAN_FUNCS, > + .func[5] = MAX31785_FAN_FUNCS, > + > + .format[PSC_TEMPERATURE] = direct, > + .m[PSC_TEMPERATURE] = 1, > + .b[PSC_TEMPERATURE] = 0, > + .R[PSC_TEMPERATURE] = 2, > + .func[6] = MAX31785_TEMP_FUNCS, > + .func[7] = MAX31785_TEMP_FUNCS, > + .func[8] = MAX31785_TEMP_FUNCS, > + .func[9] = MAX31785_TEMP_FUNCS, > + .func[10] = MAX31785_TEMP_FUNCS, > + .func[11] = MAX31785_TEMP_FUNCS, > + .func[12] = MAX31785_TEMP_FUNCS, > + .func[13] = MAX31785_TEMP_FUNCS, > + .func[14] = MAX31785_TEMP_FUNCS, > + .func[15] = MAX31785_TEMP_FUNCS, > + .func[16] = MAX31785_TEMP_FUNCS, > + > + .format[PSC_VOLTAGE_OUT] = direct, > + .m[PSC_VOLTAGE_OUT] = 1, > + .b[PSC_VOLTAGE_OUT] = 0, > + .R[PSC_VOLTAGE_OUT] = 0, > + .func[17] = MAX31785_VOUT_FUNCS, > + .func[18] = MAX31785_VOUT_FUNCS, > + .func[19] = MAX31785_VOUT_FUNCS, > + .func[20] = MAX31785_VOUT_FUNCS, > + .func[21] = MAX31785_VOUT_FUNCS, > + .func[22] = MAX31785_VOUT_FUNCS, > +}; > + > +static int max31785_probe(struct i2c_client *client, > + const struct i2c_device_id *id) > +{ > + struct device *dev = &client->dev; > + struct pmbus_driver_info *info; > + s64 ret; > + > + info = devm_kzalloc(dev, sizeof(struct pmbus_driver_info), GFP_KERNEL); > + if (!info) > + return -ENOMEM; > + > + *info = max31785_info; > + > + ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, 255); > + if (ret < 0) > + return ret; > + > + return pmbus_do_probe(client, id, info); > +} > + > +static const struct i2c_device_id max31785_id[] = { > + { "max31785", 0 }, > + { "max31785a", 0 }, > + { }, > +}; > + > +MODULE_DEVICE_TABLE(i2c, max31785_id); > + > +static struct i2c_driver max31785_driver = { > + .driver = { > + .name = "max31785", > + }, > + .probe = max31785_probe, > + .remove = pmbus_do_remove, > + .id_table = max31785_id, > +}; > + > +module_i2c_driver(max31785_driver); > + > +MODULE_AUTHOR("Andrew Jeffery <andrew@xxxxxxxx>"); > +MODULE_DESCRIPTION("PMBus driver for the Maxim MAX31785"); > +MODULE_LICENSE("GPL"); -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
